How To Tell if Younger Single Guy is Interested In Older MW?

Will try to keep this short.
I only see him once a week and it is at a sporting event we both attend so we are around people all the time. I caught him checking me out one night but didn't think much of it. Then another night I saw him watching me out of the corner of his eye but would not look at me directly acting like he didn't notice me.
I started making a point of saying hi to him and got big smiles. Last time I saw him I was talking to people on his team so added him in the conversation. We talked and teased each other a bit and were competing with each other to see who did better even though we were not actually playing each other (we were near his team enough to chat). Funny he did much worse after I said we should have a contest to see who did better.

Afterward he came out with others even though we didnt sit together. He NEVER has before. He in fact told me he was going out with friends after the game. He also left the bar the exact time when I did and I said I thought he was going out. he replied he was now and I should go with them (it was only he and another guy not in the league).
I was shocked he said this (he seems very shy) and just replied I would but had to get home. I am shocked because 1) I am married and 2) there is a very big age difference (He is mid 20's I am in my early 50's). I am told I look very young for my age and am in pretty decent shape. I know this is a very slippery slope and not sure what I am looking for here. Right now I am asking opinions if you think he is interested and looking to see where it could go, he is naive and just teasing or playing games with me.
This week I am actually playing against his team which he informed me of last week and said it would be a real competition. I know how to push the envelope somewhat and try and get a better reading but do not want to go too far and scare him off. I guess my ego needs to know is this just a game to him?
What do you think? Yes I am obsessing. lol